All, I recently deleted my truck to the likings of a Mini-Max (running HD300 tunes), 5" turbo back Flo-Pro, EGR delete, coolant flush and filter. I'm due for an oil change and wanted to know if it would benefit the truck to switch over to synthetic oil. Currently I am running Rotella 15w-40, but I was told before switching oil before a delete is pointless. Well now that I'm deleted should I make the switch? What would be the new benefits?

I run T6 Rotella in 5/40 and with religious Blackstone oil reports Ive been able to extend my oil change intervals to 12K miles. (I actually save money running synthetic for 12K miles compared to running conventional for 3K miles) Mind you I don't recommend jumping to a 12K interval without doing a few oil reports as it will really depend on the truck as to how far you can stretch the intervals. If your interesting in running a longer interval, go a bit longer say 4500/5K miles then send in for an oil report and go from there.

When I lived in Iowa it really did help with cold weather starting as well. Also you'll have to get synthetic significantly hotter, compared to conventional, before it starts breaking down.

I run synthetic for two main reasons, #1 Better protection, #2 Extended drain intervals.

You won't see any real noticeable difference in daily driving, MPG etc etc. But IMHO it will make a big difference in the longterm health of your engine.

That being said, if you stick to 3K miles oil changes I don't see much reason to go synthetic as it is significantly more expensive. But if your going to run longer than 3K intervals I would go synthetic.

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